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P1931 套利
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Luogu/problem/P1931/P1931.cpp
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46
Luogu/problem/P1931/P1931.cpp
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#include <bits/stdc++.h>
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using namespace std;
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int n, m, c;
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double w, g[35][35];
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map<string, int> kv;
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string s, s1, s2;
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bool floyd() {
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for (int k = 1; k <= n; k++) {
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for (int i = 1; i <= n; i++) {
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for (int j = 1; j <= n; j++) {
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g[i][j] = max(g[i][j], g[i][k] * g[k][j]);
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}
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}
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}
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for (int i = 1; i <= n; i++) {
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if (g[i][i] > 1) {
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return true;
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}
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}
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return false;
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}
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int main() {
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while (cin >> n, n) {
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kv.clear();
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for (int i = 1; i <= n; i++) {
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for (int j = 1; j <= n; j++) {
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g[i][j] = i == j ? 1 : 0;
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}
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}
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for (int i = 1; i <= n; i++) {
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cin >> s;
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kv[s] = i;
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}
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cin >> m;
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for (int i = 1; i <= m; i++) {
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cin >> s1 >> w >> s2;
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g[kv[s1]][kv[s2]] = w;
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}
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cout << "Case " << ++c << ": " << (floyd() ? "Yes" : "No") << endl;
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}
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return 0;
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}
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